class_docstr: ReferenceText input is either a sequence of lines without LF or a single string
  to be split into lines on LF
code: def _diff(self, ref_name, ref, doc):
      doc = _ensure_lines(doc)
      lines = [line + "\n" for line in doc]
      _diff_lines(ref_name, ref.splitlines(True), lines)
  
imports: import datetime
  import decimal
  import difflib
  import json
  import os
  import traceback
  from collections.abc import Iterable
  from typing import Any
label_desc: Use image node_id 3 for calling the ReferenceText obj's underlying member method code with example usage: obj._diff(ref_name, ref, doc) without return types